Son allegedly stabs, kills Oklahoma labor commissioner

Police say Costello's son, Christian, fatally stabbed his father at an Oklahoma City restaurant. 

Officers believe the father and son met at a Braum's in the northwest part of the city to settle an earlier argument.

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Witnesses reported the two began arguing when the situation got violent. 

According to those witnesses, Christian Costello used a steak knife and stabbed his father multiple times.

Mark Costello allegedly stumbled out of the restaurant, and his son followed him and resumed the attack. 

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Officials told KOKI-TV that people stopped Christian Costello and held him until police arrived. His father died at the hospital. 

Mark Costello, a Bartlesville native, began serving as commissioner in 2010. 

His death sent shock waves through many Oklahoma communities.  

Sen. James Lankford released the following statement:

"My family is stunned and deeply grieved to hear of the tragic death of Labor Commissioner Mark Costello.  Mark was passionate about our nation, conservative fiscal principles, and the people of our state. Mark was a friend, and as we grieve, we will also pray for his family as they deal with this unbelievable tragedy."

Oklahoma Insurance Commissioner John Doak released the following statement:

"I am deeply saddened by the loss of my dear friend Mark Costello. He was a wonderful leader and public servant. This is a major loss to the state of Oklahoma and everyone who loved Mark. My thoughts and prayers go out to his beloved wife Cathy and their family."

Jim Marshall, Oklahoma Department of Labor Chief of Staff, also released a statement:

"Mark Costello was a tremendous leader, colleague and most importantly friend to all of those at the Oklahoma Department of Labor. Our hearts ache as an agency for this tragic event and our department grieves for his family during this very difficult time. We ask for your prayers and respect for the family of Commissioner Costello."

– KOKI-TV is working to gather more information on this developing story.

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